Sec. 143.103.  IMMUNITY FROM LIABILITY.  A person whose vehicle strikes, kills, injures, or damages an unattended animal running at large on a highway is not liable for damages to the animal except as a finding of:
(1)  gross negligence in the operation of the vehicle;  or
(2)  wilful intent to strike, kill, injure, or damage the animal.
Acts 1981, 67th Leg., p. 1350, ch. 388, Sec. 1, eff. Sept. 1, 1981.